Presser-foot-actuating mechanism for sewing-machines



(N0 Model.)

B. M. STAPLES. PRESSER FOOT AGTUATING MECHANISM FOR SEWING MACHINES. No. 434.003.

Patented Aug. 12, 1890.

wane/wee abtozmua' UNITED STATES PATENT OFFICE.

ELIAL M. STAPLES, OF ELIZABETH, NEIV JERSEY, ASSIGNOR TO THE SINGER MANUFACTURING COMPANY, OF NEIV JERSEY.

PRESSER-FOOT-ACTUATING MECHANISM FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 434,003, dated August 12, 1890.

Application filed May 19, 1890. Serial No. 352,291. (No model.)

To all whom it may concern:

Be it known that I, ELIAL M. STAPLES, a

citizen of the United States, residing at Eliza beth, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Sewing Machine Presser- Foot Mechanism, of which the following is a specificatiomreference being had therein to the accompanying drawings.

My invention relates to the presser-foot mechanism of sewing machines, and has for its object to provide alternating pressers or alternately-lifted pressers, one or the other of which is always in contact with the work, the r 5 main presser swinging forward with the work when the latter is advanced by the feed and then being lifted so as to be returned by a spring, the auxiliary presser bearing on the work when the main presser is lifted and then being lifted when the feed occurs and the main presser is swinging forward with the advancing work, thus specially adapting the machine for those kinds of work wherein the drag of the presser is objectionable in that the work is liable to be injured by undue stretching.

In the drawings, Figure 1 is a side view,

with the casing in section, of the head at the forward part of the bracket-arm of a Singer 3o sewing-machine embodying my invention.-

Fig. 2 is a frontview of the head with the face-plate removed, and Fig. 3 is a view of the presser mechanism from the rear, or looking from the inside of the head outward. 3 5 The main rotating shaft A, having in the crank-disk a the crank-pin I), connected by a pitman b with the needle-bar B, is the common construction with machines of this class. C is the presser-bar, arranged in the usual 0 position in the head, and to the said bar is attached an angular arm or bracket 0, provided with a roller-stud c, the said bar carrying at its lower end a small presser-foot 0 which will herein be termed the auxiliary presser. D is a flat bar arranged edgewise to the front of the head and fitted to slide up and down in suitable ways in the head, the said bar D being attached to a block d, through which the presser-bar 0 slides, the said block having a lug or arm d engaged by the lifter E.

The needle-bar operating crankpin 12 is provided with an arm bihaving a roller-stud crank-pin b of slight eccentricity or small throw relative to the shaft A, said crank-pin b entering a slot f in the upper or verticalarln of a bell-crank lever F, pivoted at f on the block cl, and having at the outer end of its lower or horizontal'arm a slot f receiving the roller-stud c of the arm or bracket 0, rigidly attached to the presser-barO.

Pivotally attached at d to the bar D is the swinging presser-bar G, carrying at its lower end the main presser g, which bears on the feed-dog h in the usual manner, the said dog being secured to the feed-bar H, connected to and moved back and forth horizontally by the arm t' of the feeding rock-shaft I, common to Singer machines. Bearing against the rear edge of the swinging bar Gis a springk, attached at its upper end to the bar D and serving to return the said swinging bar to its normal position when it is lifted from the work after the feed has occurred.

The bar D is pressed downward by the usual depressing-spring m, bearing on the block d, attached to said bar, and the pressure of the said spring is transmitted to the presser-bar O to depress said bar and its foot 0 through the arm 0 and the bell-crank lever F, with which said arm is connected, said lever being pivoted on the said block, as heretofore stated.

From the construction of parts as above described it results that when the shaft A is rotated the crank-pin 17 working in the slot f of the bell-crank lever F, will impart a rocking movement to the said lever. When the main presser G is on the work, the said lever will rock on the pivot f 2 as a fulcrum, thus raising the outer end of the horizontal arm of said lever and lifting, through the arm 0, the bar 0 and the auxiliary presser 0 carried by the latter. The main presser, carried by the swinging bar D, will then be moved forward with the work as the latter is advanced by the feed-dog, no other pressure, except that imparted by the main presser, being at this time on the Work. WVhen the feed has been effected, the positions of the parts have been changed, so that the auxiliary presser is lowered on the work, and the bell- 1 swinging forward as the work is advanced by the feed and then being lifted and returned.

The auxiliary presser is provided withahole for the passage of the needle, and thus, as it is in contact with the work when the needle rises, it serves as a stripper for the latter. Both pressers can be raised from the work together by the lifter E, when desired, the slot f of the vertical arm of the lever F being of sufficient length to permit the said lever to rise when the pressers are thus elevated by the lifter.

I-claim- I. In a sewing-machine, the combination,

with a vertically-movable bar and a swing; ing spring-retracted main presser-foot piv-:

otally connected therewith, of a bell-crank lever pivotally connected with said bar and having vertical and horizontal arms, a rotating device engaging the said vertical arm of said lever and a presser-bar carrying an auxi iliary presser and providedwith an arm connected with the horizontal arm of the said lever, whereby the said pressers will be lifted alternately and the said main 'presser, after swinging forward with the feed, will be re turned by its spring.

2. In a sewing-machine, the combination, with the presser-bar C, having the rigid arm a and carrying the auxiliary presser c of the bar D, provided with the block cl, the bellcrank lever F, having slotted vertical and horizontal arms, the latter connected with the said arm c,a rotating device, as crank-pin 19 engaging the said slotted vertical arm,

the swinging bar G, pivotally attached to the said bar D and provided with the main presser g, and the returning-spring k.

3. In a sewing-machine, the combination, with the shaft A, having crank-disk a, provided with crank-pin I), having arm b carrying crank-pin 19 of the presser-bar O, carrying the auxiliar r presser c and providedwith the angular arm 0, having stud c, the bar D, provided with the block d, the spring m, bearing on the said block, the bell-crank lever F, pivoted to the said block and having slotted vertical and horizontal arms, the said vertical arm being engaged by said crank-pin b and the said horizontal arm by the said stud c, the swinging bar G, pivotally attached to the said bar D and carrying the'main presser g, and the returning-spring 7c.

4. In a sewing-machine, the combination,

5 with the shaft A, having a crank-disk a, provided with crank-pin I), having arm bicarrying crank-pin 12 of the presser-bar 0, carrying the auxiliary presser c and provided with the angular arm 0, having stud c, the

bar D, provided with the block (I, having the arm 01, the spring m, bearing on the said block, the bell-crank lever F, pivoted to said block and having slotted vertical and horizontal arms, the said vertical arm being engaged by said crank-pin b and the said horizontal arm by the said stud c, the swinging bar G, pivotally attached to the said bar D and carrying the main presser g, the returning-spring 7c, and the lifter E to engage said arm d and lift both pressers together.

In testimony whereof I affix my signature in presence of two witnesses.

ELIAL M. STAPLES. WVitnesses:

J. G. GREENE, JOSEPH G. COLEMAN. 

